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Adelmi

Service · Mobile apps

Mobile app development for iOS and Android

Mobile app development for customer apps, field apps and internal tools on iOS and Android. We take your app from first prototype to App Store and Google Play release, and you talk directly with the engineers building it.

We work remotely with companies in the US, Mexico, Peru, Colombia, Ecuador and anywhere else.Where and how we work

On this page

  • Customer-facing apps
  • Offline-first field apps
  • Payments and fintech apps
  • Internal tools
  • App Store and Google Play release

Where mobile projects usually go wrong

  • Native or cross-platform, and nobody explains why

    Every vendor recommends the framework they already know, and nobody spells out what it means for cost, maintenance or performance. A wrong call at the start is paid for over the whole life of the app.

  • Apps that break without a signal

    Your sales reps or technicians work where coverage is weak, and the app just spins. Orders are lost, records are duplicated and the team goes back to paper.

  • Rejected store submissions

    The app is ready, but App Store or Google Play review rejects it over permissions, privacy disclosures or design guidelines, and every resubmission pushes the launch back.

What we build

Apps designed for real conditions: patchy coverage, busy users and people who are not technical.

  • Customer-facing apps

    Ordering, bookings, account statements or service tracking from the phone, with push notifications and an experience that brings users back.

  • Offline-first field apps

    For sales reps, collectors and technicians: capture orders, payments or visits with no signal, then sync to your back end when the connection returns.

  • Payments and fintech apps

    Payments, wallets and balance checks built with the care money demands: strong authentication, secure on-device storage and integration with payment providers and acquirers.

  • Internal tools

    Mobile apps for your own team, such as approvals, inventory counts, inspections or reports, connected to the ERP or system you already run.

  • App Store and Google Play release

    Store listings, screenshots, permissions and privacy disclosures prepared for you, and support through each review until the app is live.

Flutter app development

Flutter lets one codebase ship to iOS and Android with a consistent interface and near-native performance, which makes it our usual choice for business apps that need to reach both stores quickly and stay affordable to maintain. We have built Flutter apps that run offline, store data on the device and talk to Bluetooth printers in the field.

If you are looking to hire Flutter developers, tell us about your product and your team. We will propose how to work together, whether that is building the app end to end or another arrangement that fits what you already have.

  • One codebase for iOS and Android
  • Offline storage and background sync
  • Bluetooth and device integrations

React Native and native iOS and Android

React Native is a strong fit when your team already works in React and TypeScript, or when the app shares logic with a web product. We go fully native with Swift on iOS and Kotlin on Android when the hardware or performance requires it, for example heavy camera use, on-device processing or deep operating-system integrations.

Either way, we explain the recommendation in terms of cost, timeline and maintenance before any code is written, so the choice is yours and well informed.

How a mobile project runs

Before we quote the build, you click through your system in a prototype. After that, you see progress every week. No surprises.

  1. We learn your business

    Discovery meetings to understand your business and the features you need, before we propose anything.

    You get:
    A requirements document with the agreed scope.
    Typical time:
    1–2 weeks
  2. Clickable prototype

    Click through your system's screens and validate every flow before any code is written.

    You get:
    A clickable prototype to share with your team.
    Typical time:
    1–2 weeks
  3. Quote with options

    A phased proposal with alternatives, so you choose the scope and budget that fit.

    You get:
    A detailed phased quote, with discovery and the prototype deducted.
    Typical time:
    2–3 days after prototype approval
  4. Phased development

    We build in phases and show you working software at the end of each one.

    You get:
    A demo per phase, a short weekly update and a test environment to watch your system take shape.
    Typical time:
    Set in the quote
  5. Testing

    We test every flow, and your team signs off before anything goes live.

    You get:
    A release ready for your approval.
    Typical time:
    Set in the quote
  6. Launch and handover

    We launch your system or app, train your team and hand over every account.

    You get:
    Servers, app store listings and domains in your name; the code and design are yours once paid in full.
    Typical time:
    Set in the quote
  7. Warranty and support

    Every project comes with a 60-day warranty. After that, you choose how we continue.

    You get:
    Free fixes during the warranty, then a monthly plan or hourly support.
    Typical time:
    60-day warranty, then ongoing

The right mobile stack for each app

Flutter and React Native for most projects; Swift and Kotlin when the app needs to go deep into the device.

Mobile

  • React Native
  • Flutter
  • Swift
  • Kotlin

Cloud and data

  • AWS serverless
  • Terraform
  • AWS CDK
  • Docker
  • Kubernetes
  • PostgreSQL
  • Supabase
  • Redis
  • MongoDB

A recent project

  • Avitalsa: Flutter app for field sales and collections

    An app for a sales team in the field that records orders, quotes, payments, delivery notes and weighing operations, prints receipts on Bluetooth thermal printers and keeps working offline, syncing with the central system when back online.

Mobile app development FAQ

Flutter or React Native?

Both are production-ready. We choose based on your team’s stack, any existing code and the native features the app needs, and we explain the trade-offs before you decide.

Can you build apps that work offline?

Yes, with local storage on the device and background sync, plus clear rules for resolving conflicts so nothing is lost or duplicated.

Do you handle App Store and Google Play submission?

Yes, under your own developer accounts, so the app stays in your name. We prepare the listings and privacy disclosures and support you through each review. Every project also has a 60-day warranty: if something we built does not work as agreed, we fix it at no cost.

Can I hire Flutter developers from you as a team extension?

Tell us about your team, your product and what you need, and we will propose how to work together.

Can the app connect to our existing systems?

Yes. We connect it to your ERP, CRM, payment providers and other services through APIs, so data flows without manual re-entry.

API integration
How do you work with companies in other countries?

We work remotely with companies anywhere, on UTC-5 all year, and bill in USD. We can work in English or Spanish, with video calls, shared tools and deliveries you can try yourself.

  • Web applications

    Fast, secure and easy-to-use platforms, portals and dashboards, ready to grow with you.

  • API integration

    Payment gateways, ERPs, e-invoicing and third-party services connected without friction.

  • Ecuador

    An engineering partner in a nearby time zone that bills in dollars, works in English and ships often.

  • Nearshore Latin America

    A partner in a nearby time zone: live calls, same-day demos and decisions that keep moving at your pace.

Tell us about the app you have in mind

Send us a short note on who will use it and what it must do, and we will reply with the next steps towards a quote.

We work remotely with companies anywhere. Our team is based in Quito, Ecuador; in-person meetings in Quito on request.